grafana/k6 · error

not found: %s

Error message

not found: %s

What it means

Raised in fetch when loading a remote module over https returns HTTP 404. It means the URL was reachable but the resource no longer exists — a broken or moved module link, not a network failure. The at-fault input is the fetched URL that returned 404.

Source

Thrown at internal/loader/loader.go:222

func fetch(logger logrus.FieldLogger, u string) ([]byte, error) {
	logger.WithField("url", u).Debug("Fetching source...")
	startTime := time.Now()
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u, nil)
	if err != nil {
		return nil, err
	}
	res, err := http.DefaultClient.Do(req) //nolint:gosec
	if err != nil {
		return nil, err
	}
	defer func() { _ = res.Body.Close() }()

	if res.StatusCode != http.StatusOK {
		switch res.StatusCode {
		case http.StatusNotFound:
			return nil, fmt.Errorf("not found: %s", u)
		default:
			return nil, fmt.Errorf("wrong status code (%d) for: %s", res.StatusCode, u)
		}
	}

	data, err := io.ReadAll(res.Body)
	if err != nil {
		return nil, err
	}

	logger.WithFields(logrus.Fields{
		"url": u,
		"t":   time.Since(startTime),
		"len": len(data),
	}).Debug("Fetched!")
	return data, nil
}

View on GitHub (pinned to 01ffac6f24)

Solutions

1. Verify the module URL is correct and still published
2. Pin to a version that exists (check the CDN/repository for the current path)
3. Replace with a locally vendored copy of the module

When it happens

Trigger: Thrown at internal/loader/loader.go:222 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@01ffac6f24 (2026-08-18). Data as JSON: /api/errors/01d3c56baa7f017b. Report an issue: GitHub.